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Q.

Two air bubbles of radii 2 mm and 4 mm, formed in the same liquid come together to form a big bubble. If the surface tension of the liquid is 0.70 Nm-1, the radius of curvature of common interface to both bubbles will be

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a

6 mm with concave surface towards smaller bubble.

b

2 mm with concave surface towards bigger bubble.

c

4 mm with concave surface towards smaller bubble.

d

4 mm with concave surface towards bigger bubble.

answer is C.

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